diff --git a/js/reveal.js b/js/reveal.js
index fabcded..c7860ad 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -1317,7 +1317,7 @@ var Reveal = (function(){
// Prefer slide argument, otherwise use current slide
slide = slide ? slide : currentSlide;
- return slide && !!slide.parentNode.nodeName.match( /section/i );
+ return slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );
}
diff --git a/js/reveal.min.js b/js/reveal.min.js
index f755f10..e0a1dc9 100644
--- a/js/reveal.min.js
+++ b/js/reveal.min.js
@@ -1,8 +1,8 @@
/*!
- * reveal.js 2.6.0 (2013-08-22, 19:33)
+ * reveal.js 2.6.0 (2013-08-23, 09:08)
* http://lab.hakim.se/reveal-js
* MIT licensed
*
* Copyright (C) 2013 Hakim El Hattab, http://hakim.se
*/
-var Reveal=function(){"use strict";function e(e){return t(),Ht||Rt?(window.addEventListener("load",T,!1),u(Ut,e),y(),n(),void 0):(document.body.setAttribute("class","no-transforms"),void 0)}function t(){Rt="WebkitPerspective"in document.body.style||"MozPerspective"in document.body.style||"msPerspective"in document.body.style||"OPerspective"in document.body.style||"perspective"in document.body.style,Ht="WebkitTransform"in document.body.style||"MozTransform"in document.body.style||"msTransform"in document.body.style||"OTransform"in document.body.style||"transform"in document.body.style,Yt=navigator.userAgent.match(/(iphone|ipod|android)/gi)}function n(){function e(){n.length&&head.js.apply(null,n),r()}for(var t=[],n=[],o=0,a=Ut.dependencies.length;a>o;o++){var i=Ut.dependencies[o];(!i.condition||i.condition())&&(i.async?n.push(i.src):t.push(i.src),"function"==typeof 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n={background:e.getAttribute("data-background"),backgroundSize:e.getAttribute("data-background-size"),backgroundImage:e.getAttribute("data-background-image"),backgroundColor:e.getAttribute("data-background-color"),backgroundRepeat:e.getAttribute("data-background-repeat"),backgroundPosition:e.getAttribute("data-background-position"),backgroundTransition:e.getAttribute("data-background-transition")},r=document.createElement("div");return r.className="slide-background",n.background&&(/^(http|file|\/\/)/gi.test(n.background)||/\.(png|jpg|jpeg|gif|bmp)$/gi.test(n.background)?r.style.backgroundImage="url("+n.background+")":r.style.background=n.background),n.backgroundSize&&(r.style.backgroundSize=n.backgroundSize),n.backgroundImage&&(r.style.backgroundImage='url("'+n.backgroundImage+'")'),n.backgroundColor&&(r.style.backgroundColor=n.backgroundColor),n.backgroundRepeat&&(r.style.backgroundRepeat=n.backgroundRepeat),n.backgroundPosition&&(r.style.backgroundPosition=n.backgroundPosition),n.backgroundTransition&&r.setAttribute("data-background-transition",n.backgroundTransition),t.appendChild(r),r}h()&&document.body.classList.add("print-pdf"),$t.background.innerHTML="",$t.background.classList.add("no-transition"),f(document.querySelectorAll(Ot)).forEach(function(t){var n;n=h()?e(t,t):e(t,$t.background),f(t.querySelectorAll("section")).forEach(function(t){h()?e(t,t):e(t,n)})})}function 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